Hi Chris:
Wow, that is awful! I'm so sorry to hear about your situation. I hope you and your family are at least safe somewhere.
You are right; you cannot forward a GV number to a Fi number, nor a Fi number to a GV number. This is because Fi and GV use the same GV backend, and it creates a text message forwarding nightmare, so it is prohibited.
Unfortunately, there is nothing you can do about it. However, you can run Google Hangouts on your phone, if it's an Android or iPhone. For Android, you will also need to download the "Hangouts Dialer" companion app, in addition to the main Hangouts app. Sign in with your Google Voice account's user ID and password, and you will be able to make and receive phone calls using that number.